Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh lap » thanh san, phan lap, thanh hai
duc tang » duc thang, tuc tang, duc tung
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
lap cua » lai cua, tap cua, lam cua
y nang » ky nang, ly nang, v nang
ve cao » va cao, ve bao, ve cac
cua su » qua su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y nang xa hoi. hieu ve cao ((duc tang) or (duc tan)) thanh lap cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang xa hoi. hieu ve cao ((duc tang) OR (duc tan)) thanh lap cua su.
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang xa hoi. hieu ve cao ((duc tang) or (duc tan)) thanh lap cua su*.